Multi-element catalytic iron-carbon microelectrode filler using rare earth tailings as raw material and its preparation method and application

A rare earth tailings, catalytic iron-carbon technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problem of small specific surface area of ​​active fillers on the surface of raw materials, affecting the reaction efficiency of fillers, oxidation Reduce the problem of low potential difference, achieve the effect of saving resources, responding quickly and thoroughly, and reducing the amount of dosage

Active Publication Date: 2021-12-14
INNER MONGOLIA UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Currently commercially available micro-electrolytic filler products have many shortcomings, mainly including: (1) only iron powder, carbon powder and binder are used as raw materials, and the redox potential difference is low; (2) the particle size of raw materials is large, so the The surface activity and the specific surface area of ​​the filler are small; (3) The amount of binder that does not participate in the reaction is too large, which affects the reaction efficiency of the filler

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  • Multi-element catalytic iron-carbon microelectrode filler using rare earth tailings as raw material and its preparation method and application

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preparation example Construction

[0027] In addition, for the multi-component catalytic iron-carbon microelectrode filler of the present invention, the applicant provides a preparation method specifically, such as figure 1 shown, including the following steps:

[0028] S1: Put the rare earth tailings, limonite and coke into a ball mill for ball milling, and then pass through a 200-mesh sieve.

[0029] S2: Mix the rare earth tailings, limonite and coke after ball milling and sieving in proportion, then reduce and roast at 800-1000°C for 1-3 hours, and cool after roasting.

[0030] S3: Magnetic separation is performed on the reduced and roasted samples to obtain ferromagnetic materials (sponge iron) and non-magnetic materials, respectively.

[0031] S4: Add binder and porogen to the ferromagnetic material (sponge iron), mix and stir evenly, then press and form spherical particles with a diameter of 8-10cm, and then gradually heat up at a speed of 3-5°C / min To 70 ~ 80 ℃, and then continue to dry for 20min.

[...

Embodiment 1

[0040] This implementation provides a method for preparing multi-component catalytic iron-carbon microelectrode fillers by using rare earth tailings, including the following steps:

[0041] S1: Mix 35g of rare earth tailings, 30g of limonite and 75g of coke, perform ball milling, and pass through a 200-mesh sieve.

[0042] S2: The rare earth tailings, limonite and coke that have been sieved by the ball mill are uniformly mixed in a mixing box, and then reduced and roasted at 1000°C.

[0043] S3: performing magnetic separation on the reduced and roasted samples to obtain ferromagnetic materials and nonmagnetic materials respectively.

[0044] S4: Add 40g of kaolin and 15g of activated carbon to the magnetically separated Fe element, add a certain amount of water, slowly shake it to form spherical particles with a particle size of 9mm, and then put it into a muffle furnace at a speed of 3°C / min Gradually raise the temperature to 80°C, continue drying for 20 minutes, and evapora...

Embodiment 2

[0048] This implementation provides a method for preparing multi-component catalytic iron-carbon microelectrode fillers by using rare earth tailings, including the following steps:

[0049] S1: Mix 35g of rare earth tailings, 30g of limonite and 75g of coke, perform ball milling, and pass through a 200-mesh sieve.

[0050] S2: The rare earth tailings, limonite and coke that have been sieved by the ball mill are uniformly mixed in a mixing box, and then reduced and roasted at 900°C.

[0051] S3: performing magnetic separation on the reduced and roasted samples to obtain ferromagnetic materials and nonmagnetic materials respectively.

[0052] S4: Add 40g of kaolin and 15g of activated carbon to the magnetically separated Fe element, add a certain amount of water, slowly shake it to form spherical particles with a particle size of 8mm, and then put it into a muffle furnace at a speed of 5°C / min Gradually raise the temperature to 70°C, continue drying for 20 minutes, and evaporat...

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Abstract

The invention relates to a multi-element catalytic iron-carbon microelectrode filler using rare earth tailings as a raw material, a preparation method and application thereof. The iron-carbon microelectrode filler is composed of rare earth tailings, limonite, coke, binder and porogen; the mass ratio of rare earth tailings, limonite and coke is (30-35): (30-35): (30-40), and the ratio of Fe / C is greater than or equal to 80%; the binder is selected from kaolin, and the dosage is 20-30% of the total mass of rare earth tailings and coke; the porogen is selected from activated carbon, and the dosage is rare earth tailings and coke. 5-12% of the total mass of coke. It can be effectively used in the process of wastewater treatment, especially in the treatment of printing and dyeing wastewater that is difficult to biodegrade, has high chroma and low B / C ratio. The microelectrode filler of the present invention is prepared by using rare earth tailings as raw materials, which not only realizes solid waste recycling, but also can be effectively used to treat high-concentration organic waste water to achieve the purpose of waste treatment and recycling, which can be said to kill two birds with one stone.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a multi-element catalytic iron-carbon microelectrode filler using rare earth tailings as a raw material and a preparation method and application thereof. Background technique [0002] Due to the backward mining technology and lax supervision of rare earth tailings, the amount of tailings is huge, which seriously deteriorates the ecological environment. Therefore, the comprehensive utilization of rare earth tailings is an urgent problem to be solved. [0003] With the rapid development of my country's chemical industry, various new chemical products are applied to all walks of life, especially in heavy polluting industries such as medicine, chemical industry, electroplating, printing and dyeing. environmental pollution problems. The main reason why organic wastewater is difficult to treat is poor biodegradability, complex composition, large discharge volume, and difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/467C02F9/06
CPCC02F1/46109C02F1/4672C02F1/4676C02F1/70C02F1/72C02F9/00C02F1/5245C02F1/66C02F2001/46133C02F2001/007
Inventor 张凯罗慧娟王振峰李娜金光武文斐赵增武李保卫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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